127.0.0.1

CASE-LOCAL-001 · friendly stack inspection

localcop.dev

A neighborhood inspector for localhost mysteries

Lift the blotter and inspect the stack.

A pastel Victorian field notebook for learning ports, requests, proxies, logs, and certificates without the cold glare of a corporate dashboard.

$
Begin the local patrol
localhost :3000

Soap-bubble lenses briefly enlarge each clue as it floats by the ledger.

Clue 01
D

PORT EVIDENCE · CASE-LOCAL-001

The Doorbell on Port 3000

Your app answers the door at a port. Treat :3000 like a brass bell pull: if it rings, something is listening; if it does not, the route may be sleeping.

localcop inspect :3000
status: listening
hint: open http://localhost:3000
A port is simply a numbered doorway on your machine.
desk:3000app
Clue 02
I

REQUEST INTERROGATION

Interrogate the Request

A request leaves a trail: method, path, headers, and response. Ask the polite questions first, then pin the answers like pressed fern specimens.

GET /health HTTP/1.1
host: localhost:3000
response: 200 OK
If /health is green, the service breathes.
GET/health200 OK
Clue 03
F

BOTANICAL ROUTE MAP

Follow the Proxy Vine

When the browser asks one address and the answer grows from another, follow the ivy. A proxy vine connects request → route → response without uprooting your local garden.

proxy /api → http://localhost:5173
route: /api/clues
response: { "case": "open" }
Proxy rules are forwarding labels.
requestrouteresponse
Clue 04
C

LOCAL CLOSURE LEDGER

Close the Case Locally

Finish with logs, certificates, and a clean restart. The best local patrol closes gently: note the clue, mend the route, and leave the desk tidy for tomorrow.

tail local.log
cert: trusted for localhost
case: closed locally
A tidy local close means the browser trusts your certificate.
127.0.0.1
closed